body {
    background: url("image/bg.png") no-repeat;
    background-size: 100%;
}
 
#frame {
    width: 450px;
    height: 300px;
    padding: 13px;
 
    position: absolute;
    margin-left: 53%;
    margin-top: 22%;
    margin-bottom: 280px;
    background-color: rgba(196, 200, 209, 0.5);
 
    border-radius: 10px;
    text-align: center;
}
 
form p > * {
    display: inline-block;    //块级，一行
    vertical-align: middle;   //垂直对齐图像
}
 
#yibanlogo {
    max-width:300px;width:expression(this.width > 300 ? "300px" : this.width);

}
 
.input {
    width: 70px;
    height: 30px;
    line-height: 28px;
    text-align: center;

    font-size: 15px;
    font-family: 宋体;
 
    color: white;
    background-color: #3a6b97;
    border-top-left-radius: 5px;
    border-bottom-left-radius: 5px;
}
 
.field {
    width: 278px;
    height: 28px;
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
    border: 0;
}

#contro {
    padding: 0 155px;
}

 
.submit {
    width: 120px;
    height: 28px;
    line-height: 28px;
    text-align: center;
    
    font-size: 15px;
    font-family: 宋体;
    
    color: white;
    background-color: #3a6b97;
    border-radius: 6px;
    border: 0;
 
    float: left;
}

.submit:hover {
    color: #0a1a59;
    background-color: #3a6b97
}
 
@media screen and (max-width: 1024px) {
#frame
{
    height:256px;
    margin-left:34%;
    margin-top: 22%;
}
    
}